/* eslint-disable jsx-a11y/anchor-is-valid */
import React from "react";
import ReactDOM from "react-dom";
import axios from "axios";
import { useQuery, queryCache, ReactQueryConfigProvider } from "react-query";
import { ReactQueryDevtools } from "react-query-devtools";

// Define a default query function that will receive the query key
const defaultQueryFn = async (key) => {
  const { data } = await axios.get(
    `https://jsonplaceholder.typicode.com${key}`
  );
  return data;
};

function App() {
  const [postId, setPostId] = React.useState(-1);

  return (
    <>
      <ReactQueryConfigProvider
        // provide the default query function to your app via the config provider
        config={{
          queries: {
            queryFn: defaultQueryFn,
          },
        }}
      >
        <p>
          As you visit the posts below, you will notice them in a loading state
          the first time you load them. However, after you return to this list
          and click on any posts you have already visited again, you will see
          them load instantly and background refresh right before your eyes!{" "}
          <strong>
            (You may need to throttle your network speed to simulate longer
            loading sequences)
          </strong>
        </p>
        {postId > -1 ? (
          <Post postId={postId} setPostId={setPostId} />
        ) : (
          <Posts setPostId={setPostId} />
        )}
      </ReactQueryConfigProvider>
      <ReactQueryDevtools initialIsOpen />
    </>
  );
}

function Posts({ setPostId }) {
  // All you have to do now is pass a key!
  const { status, data, error, isFetching } = useQuery("/posts");

  return (
    <div>
      <h1>Posts</h1>
      <div>
        {status === "loading" ? (
          "Loading..."
        ) : status === "error" ? (
          <span>Error: {error.message}</span>
        ) : (
          <>
            <div>
              {data.map((post) => (
                <p key={post.id}>
                  <a
                    onClick={() => setPostId(post.id)}
                    href="#"
                    style={
                      // We can use the queryCache here to show bold links for
                      // ones that are cached
                      queryCache.getQueryData(["post", post.id])
                        ? {
                            fontWeight: "bold",
                            color: "green",
                          }
                        : {}
                    }
                  >
                    {post.title}
                  </a>
                </p>
              ))}
            </div>
            <div>{isFetching ? "Background Updating..." : " "}</div>
          </>
        )}
      </div>
    </div>
  );
}

function Post({ postId, setPostId }) {
  // You can even leave out the queryFn and just go straight into options
  const { status, data, error, isFetching } = useQuery(`/posts/${postId}`, {
    enabled: postId,
  });

  return (
    <div>
      <div>
        <a onClick={() => setPostId(-1)} href="#">
          Back
        </a>
      </div>
      {!postId || status === "loading" ? (
        "Loading..."
      ) : status === "error" ? (
        <span>Error: {error.message}</span>
      ) : (
        <>
          <h1>{data.title}</h1>
          <div>
            <p>{data.body}</p>
          </div>
          <div>{isFetching ? "Background Updating..." : " "}</div>
        </>
      )}
    </div>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
